test: Added test cases for toNumber method

test/toNumber.spec.js

@@ -0,0 +1,22 @@
+import toNumber from '../src/toNumber';
+describe('toNumber', () => {
+    it('should return the given number', () => {
+        expect(toNumber(34)).toBe(34);
+    });
+
+    it('should convert the given number', () => {
+        expect(toNumber('23')).toBe(23);
+    });
+
+    it('should return the NaN', () => {
+        expect(toNumber('this-shall-pass')).toBe(NaN);
+    });
+
+    it('should return the default value as NaN', () => {
+        expect(toNumber('this-shall-pass', {})).toBe(NaN);
+    });
+
+    it('should return the default value', () => {
+        expect(toNumber({}, { defaultValue: 47 })).toBe(47);
+    });
+});